Impeller for coal water slurry pump

Abstract

The invention provides an impeller for a coal water slurry pump. The impeller for the coal water slurry pump comprises a front cover plate, main blades and a rear cover plate; the center of the front cover plate is of an impeller inlet; the main blades are arranged between the front cover plate and the rear cover plate; the main blades, the front cover plate and the rear cover plate are integrated; the main blades comprise multiple long blades and short blades which are alternatively arranged at intervals, so an impeller runner is formed; at one side, close to the impeller inlet, of the impeller runner, the long blades are longer than the short blades. The impeller for the coal water slurry pump has the advantages that the sucking property of the impeller is improved, the hydraulic loss of the impeller inlet is reduced, and coal water slurry is prevented from being accumulated at the impeller inlet; the influence of flow separation and backflow phenomena at an outlet to the impeller performance is reduced or prevented, and the scouring abrasion of the impeller outlet is reduced; the disc loss is reduced, the efficiency is improved, and an energy saving aim is realized. The rotary speed of the pump is reduced under the same impeller outer diameter condition, and the abrasion of the impeller and other parts of the pump is reduced.

Description

technical field [0001] The invention relates to the technical field of centrifugal pumps, in particular to an impeller for a coal-water slurry pump. Background technique [0002] In the prior art, in the gasification section of coal chemical industry projects, most manufacturers adopt the coal water slurry process and the coal water slurry gasification process. In the coal water slurry gasification process, the low pressure coal water slurry pump More and more manufacturers choose centrifugal coal-water slurry pumps, and practice has proved that it is an ideal product to replace diaphragm and screw low-pressure coal-water slurry pumps. [0003] Due to the limitation of the specifications of the coal mill and other factors, the flow rate of the low-pressure coal-water slurry pump is small, the head is high, and the specific speed of the pump is small. Coupled with the high concentration of coal water slurry, wear and erosion are an important factor to be considered by centri...

AI Technical Summary

Problems solved by technology

Two problems have just been produced like this: the one, because the vane outlet placement angle is bigger, the impeller flow path diffuses seriously, will cause the decline of pump performance; Total area of ​​friction, resulting in reduced pump performance

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